In case that disabling passthrough doesn't help, my conclusion goes like this: Then your DAC doesn't support all audio codecs, and Kodi has no other choice than switching to the next audio output device (HDMI) to provide any sound.
You can buy a different DAC (HifiBerry) or an HDMI audio splitter (maybe cheaper) to get analogue audio for all sources.
Thanks for the good conversation, because you've been provided all info in an excellent way.
OK. hdmi_drive=1 was only for testing, you can remove it from config.txt again.
Your guisettings.xml says, you have audio passthrough enabled. Disable it at Settings -> System -> Audio -> Allow passthrough.
PS: The buggy file "mcp23s17.c" is a source code file, but the add-on only contains compiled files, so you can't patch it inside LE.
Da Flex where could I find these library file in LibreElec?
I think it's part of the LCDproc add-on.
Two options:
a) (easier) find another add-on / repo with the patched version (try the kodinerds repo)
b) (harder) compile a patched LCDproc add-on from source
The config.txt looks OK. The cause of the error message is a known bug, and you have to patch a file. Read here.
Good to see some progress. Please post your config.txt.
Do you have /storage/.kodi/userdata/LCD.xml present? Get the default version of the file here.
So you mean that up- and downgrading the system is necessary to install the newer ISA version while keeping all addons alive? Also, the posting said that buffering issues remained after doing this. Are those issues really gone after downgrading again with the latest libwidevine update?
The linked post was about the DAZN add-on. It had a buffering issue, which is gone since the latest libwidevine update.
Yes, you have to upgrade / downgrade LE as written in the post. It's necessary to get access to the newer add-on repo, which has the ISA version you need for Joyn.
Thanks for testing. Does it work when you play a video from USB stick?
I'm asking, because I want to know whether the HDHomeRun add-on overwrites the config.txt setting, or LE / Kodi for all sources.
Another config.txt option you could try is hdmi_drive=1. This should kill the HDMI audio completely, because it's DVI mode.
At config.txt remove hdmi_force_edid_audio=1 and add hdmi_ignore_edid_audio=1 instead.
Something's wrong. I tried version 2.4.0 linked in the thread you referenced - no videos play at all any more (several addons). Version 2.4.2 won't even install from zip file.
The instructions at my linked posting are all you need. You did something else for whatever reason. 
You have to enable LIRC by creating the config file /storage/.config/lircd.conf. Read here for details.
The Pimoroni HyperPixel (Touch Version) seems to work, too, if you are able to buy it somewhere.
Just login by SSH and "reboot". The next boot should work normally with your config.
Downgrade to 9.0.2 to avoid safe mode issues.
PS: Suggested power supply for RPi 3 is 2.5A.
Hi bartkauz,
I'm using RPi 3B+ with LE 9.0.2, and the Joyn add-on runs fine.
Update your ISA add-on this way.
I understand that you have to be sure before you buy. I'm German, so I had a look at German language Google results, too:
LibreELEC at RPi 3 with Touchscreen (German)
Maybe Google becomes your friend again, if you use the Google translation for this site. 
First he need to test the touchscreen with evtest program if he get correct (or any) data or not. If touchscreen doesn't work with evtest then he can think of better options.
Correct, proof of concept has to be first. I'm skeptical about it, but I'm thinking in a more abstract way.
I did a little more research about connecting a touchscreen to an RPi. Using the DSI port is the official way to connect one, and it's approved to work with LE. To make an USB touchscreen work, you need high speed USB to transfer display data, but your Rock64 doesn't have it. The fact that it works on Armbian is because it's not optimized for media output.
Get some DSI touchscreens, and you will make it until Halloween.
